System of riffling oscillating tables for the treatment of ores



R. E. TROTTIER. SYSTEM OF RIFFLING OSCILLATING TABLES FOR THE TREATMENT OF ORES.

' APPLICATION FILED JULY 29, 1919.

1,356,179. Patented 0 1;.19,1920.

I 2 SHEETS-SHEET 1.

R. BTROTTIER. SYSTEM OF RIFTLING OSCILLATINGTTABLES FOR THE TREATMENT OF ORES.

APPLICATION TILED JULY 29, I919.

Patented 0ct. 19, 1920.

2 SHEETS-SHEET 2.

V tate their separation.

UNITED STATES PATENT OFFICE.

RENE EMILE 'rnorrrnrwor PARIS, FRANCE.

SYSTEM OFQRIFFLING.OSCILLATING TABLES FOR THE TREATMENT OF ORES.

Specification of Letters Patent.

Patented Oct.19, 1920.

Application filed July 29, 1919. Serial :No. .313,970.

"T 0 all whom it may concern:

Wilfley system, have generally been provided on their upper surface with ridges or riiiles, of appropriatesection and length, for retaining and guiding the detained particles toward one end of the table,-on which they are spread outin layers of different specific gravities, These layers, progressing along the table under the influence of the oscillating movements, are deflected alongthe two sides of the table, and the component substances can be separately collected. However, as the size and the direction ofthe layers of different densities vary with the feed and the nature of the ores being treated, tables of this kind need constant supervision while in work in consequence of the necessity of varying continually the devices adopted for directing the separated .sub stances toward the receptacles destined to receive them.

The invention consists in a special system of rifliing for tables of this kind, which has for its object. to obviate the above mentioned inconvenience. The system consists essentially in providing the table area with riflles of convenient profile for forming, in the longitudinal direction, regular undulations, very extensive, which for preference suitably overlap one another in the direction of the advance of the ores, in a manner to permit the spreading out thereof and to facili- The whole rifiiingconstitutes across the table a surfacehaving short and regular undulations whose height varies gradually fromone section of, the table to the following section. In this way the ore which, on the first part of the, table, is confined between two adjacent rifiles passes out therefrom as soon as it arrives at the mean part thereof, and is spread out according to its specific, gravity on a fiat portion of the table to pass subsequently between extensions of the two next adjacent rifiies which act as 001- lectors and lead to the outlet. The ores thus separated by the conducting rifliescan be separately collected, without risk of mixing or disturbance of the classification.

' The accompanying drawing shows the detail of an oscillating table provided with a system of riffiing the object of the invention. Figure 1: is a plan view of the table, Figs. 2 andS are two cross sections made respectively along the lines A Band C D of Fig. 1. Figs. 4 and 5are two longitudinalsections -made respectivelyalong the lines E F and G H of Fig. 1. Fig. 6 is a diagram showing I the manner of arranging the rillies.

As is seen from the drawing, the table consists of a shelf a (FigsfQ, .3, 4 and 5) which supports atone ofits .upper corners,

the ore distributing device I) that is adjustable in position.

Above'the upper longitudinal margin of this shelf is situated the channel 0 for the supply of water which falls onto the upper margin 0 of the table. The shelf a carries longitudinal rifiies (Z, of variable profile, disposed side by side and so that vto the high part of one rifiie is juxtaposed the low part of the adjacent riffle so as to form between all the riflies a series of channels of variable section along which the ore advances. The transverse section of these rifiies is rectangular, while their longitudinal section is of a sinuous or up and downform with very extensive undulations. On Fig. 1 the low part d of the rifiies is denoted by shading while their higher parts d? are leftclear. The "longitudinal undulations, however, overlap one another, at every. two riflles, according to a law of regular. advancement, so that all the lower parts of one series of rifiles and. the higherparts of the other series are disposed along the same oblique line X X starting from the upper feed corner of the table 'whichthus presents, at a distance varying according to the amplitude of the undulations, ameanlflat part having its axis along a lineY Y parallel to the line picted in the diagram inFig. '6, where successive riflies are represented in section and turned down into the plane of the table in order to show clearly. their profile. The pitch ofthe undulations is equal inthe example illustrated, to the length of the table surface and the maxima and minima of the respective undulations may be re eated along'the line X X (Fig.6) which 1s pan allel to the line 'XXend drawn across the This arrangement is deupper corner of the table opposite to the feeding corner. The length of the table and the pitch of the undulations of the riffles are variable and depend on the nature of the ore to be treated, the inclination of the line Y Y (and consequently of the line X X which is parallel with it) being substantially that of the mean tangent to the parabolic curve of advancement of the ore on the table The classifying operation with an oscillating table provided with the improved system 'of riflles is as follows:

The core fed in by the distributer Z), suitably arranged, falls on to the table in the neighborhood of the feeding corner a,

whence the oscillating movements immedi ately make it progress in the direction of the opposite end. ater being regularly admitted by the conduit along the side a a of the table,,flows toward the opposite side 0. a with a speed dependent on the slope of the table in the transverse direction, that is to say, in the direction a a and consequently tends to carry the ore along that slope.

In consequence of the vertical classification according to specific gravity whichocours in the different longitudinal channels formed between :the riilies, the heavier particles of ore pass rapidly to the bottom of these channelswhile the lighter particles on the contrary overflowing and passing over successively all the riflies flow along the lower margin a a of the table. The heavy particles, retained gravity between successive rifiies tend to advance and debouch on to the neutral or flat zone (along Y Y) of the table, where r they immediately spread out into layers whose size varies with'the feed and the nature of the ore treated.

The water from thetfeed conduit tends 011 the contrary, while following the cross slope of the table. to follow the longitudinal chan nels along their slopes. in the direction opposite to the advancement of the ore in the. first zone of undulations that is to say, to the right of the line X X, while it tends on the contrary to advancein the direction of thisprogression in the second zone of the undulations v that is to say, to the left of the line X X, since the "slope of the chan-- 5 according to the specific nels changes in direction at that line. The result is, that in the first zone the water acting on the lighter particles draws them to the right of the table, while in the second zone its action facilitates the progress of the denser particles toward the neutral or mean part of the table. i

It will be seen that this somewhat divergent action of the water on the particles to be treated, combined with the drawing ac tion on the particles due to the movement of the table, will facilitate the spreading out of the bodies and consequently their separation, so that on their arrival in the neutral zone of the table, the particles will separate and classify themselves, so much thebetter, according to their specific gravities in distinct layers.

In consequence of their progressive movements the different layers meet immediately, beyond the line Y Y, a second zone of rillles, between which they are channeled and progress to flow, perfectly separate, along the side a a of the table without being able .to become mingled afresh, as will happen if the outlet end of thetable' does not present any device for collecting them and main- .taining them separate by directing them toward the outlet.

It goes without saying that the described system of riflling may be applied to oscillating tables of all kinds, no matter what may be the mode by which they are controlled and moved. 7

Having'thus described the nature of the said invention and the best means I know of carrying the same into practical effect, I claim I A system of rifiiing for oscillating tables for treatment of ores, which comprises an inclined shelf forming a table, an ore feeding device at one of the upper corners of the table, awater supply conduit along the upper margin of the table, longitudinal rifiles H arranged side by side on the table and having longitudinal undulations formed thereon and overlapping in such a way that the high part of one riflle is aside of the low part of the adjacent riflle so as to form longitudinal channels adapted to retain and guide the ore, a neutral zone constituted by adjacent parts of the same height of all the rifiies, for the purpose of assisting the spreading out and the separation of the ores, and extensions of the said riiiles which form collectors to conduct the separated ores, without risk of being re-mixed, to the outlet. In testimony that I claim the foregoing as my invention, I have signed my name this twenty-sixth day of June, 1919.

RENE EMILE TROTTIER.

Witness:

, CHAS. P,.P1{ESSLY. 

